High performance of visible-NIR broad spectral photocurrent application of monodisperse PbSe nanocubes decorated on rGO sheets

Shiravizadeh, A. Ghorban; Elahi, Seyed Mohammad; Sebt, S. A.; Yousefi, Ramin

doi:10.1063/1.5017226

Cited by 25 publications

(9 citation statements)

References 56 publications

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“…Figure S4 shows an X‐ray photoelectron spectrum (XPS) of synthesized PbSe with 30 nm cubes to verify the particle composition. The Pb 4f peaks at 137.7 and 142.6 eV and the Se 3d peaks at 53.7 and 54.5 eV confirm the exclusive presence of PbSe . The S 2p and O 1s peak positions do not support the formation of PbS with known S 2p peaks at 160.3 and 161.5 eV or PbO with an O 1s peak at 528.9 eV …”

Section: Resultsmentioning

confidence: 83%

“…SeSO 3 2− was then reduced in basic solution conditions to give Se 2− ions. Equations are likely involved

true Na_{2} SO_{3} + Se \to Na_{2} SeSO_{3}

true Na_{2} SO_{3} + normalH_{2} normalO \vec{\leftarrow} HSO_{3}^{-} + OH^{-} + 2 Na^{+}

true SeSO_{3}^{2 -} + 2 OH^{-} \to Se^{2 -} + SO_{4}^{2 -} + normalH_{2} normalO

…”

Section: Resultsmentioning

confidence: 99%

“…The Pb 4f peaks at 137.7 and 142.6 eV and the Se 3d peaks at 53.7 and 54.5 eV confirm the exclusive presence of PbSe. [17,21] The S2pa nd O1sp eak positions do not support the formation of PbS with known S2p peaks at 160.3 and 161.5 eV or PbO with an O1sp eak at 528.9 eV. [22,23] Because of the big change in solution color during the formationo ft hese PbSe nanocubes, it wasu seful to take photographsd uring the introduction of the reagent and crystal growth process.…”

Section: Resultsmentioning

confidence: 99%

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Aqueous‐Phase Synthesis of Size‐Tunable PbSe Nanocubes at Room Temperature for Optical Property Characterization

Chiu

Lin

Lee

et al. 2018

Chemistry A European J

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A simple aqueous‐phase synthesis of PbSe nanocubes with tunable sizes has been developed by first preparing a Na2SeSO3 stock solution through dissolution of selenium powder in a solution of Na2SO3 at 90–100 °C for 30 min, and adding part of this solution to a mixture of lead acetate and acetic acid at room temperature with stirring for only 5–8 min to complete the nanocrystal growth. Adjusting the volume of acetic acid and Na2SeSO3 solution added enabled the size of the nanocrystals to be tuned, with average edge lengths of 13 to 121 nm attained. Changes in solution color revealed very different crystal growth rates for the 13 and 121 nm nanocubes. The PbSe cubes exhibit size‐dependent absorption bands in the ultraviolet and visible‐light region; the band positions show progressive redshifts with increasing particle size. Slight photocatalytic activity upon 532 nm laser irradiation of the nanocubes suggests the presence of higher energy levels in the band structure of PbSe. The synthetic conditions can be easily scaled up to obtain a large quantity of PbSe nanocubes for applications.

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Section: Resultsmentioning

confidence: 83%

“…SeSO 3 2− was then reduced in basic solution conditions to give Se 2− ions. Equations are likely involved

true Na_{2} SO_{3} + Se \to Na_{2} SeSO_{3}

true Na_{2} SO_{3} + normalH_{2} normalO \vec{\leftarrow} HSO_{3}^{-} + OH^{-} + 2 Na^{+}

true SeSO_{3}^{2 -} + 2 OH^{-} \to Se^{2 -} + SO_{4}^{2 -} + normalH_{2} normalO

…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Aqueous‐Phase Synthesis of Size‐Tunable PbSe Nanocubes at Room Temperature for Optical Property Characterization

Chiu

Lin

Lee

et al. 2018

Chemistry A European J

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“…Graphene oxide (GO) is prepared from graphite by chemical oxidation, and then converted into graphene nanosheets in bulk quantity by chemical and thermal reduction in solution to produce graphene . Because abundant oxygen functional groups on both the basal plane and edge of GO can be used as anchoring sites for metal nanoparticles, it is possible to use them as a support to produce graphene‐nanoparticle hybrids . Also, graphene has a tendency to agglomeration due to van der Waals interactions, therefore there is an increased distance between planes especially during modification with covalently attaching of organic media .…”

Section: Introductionmentioning

confidence: 99%

Fabrication of ultra‐small ruthenium nanoparticles on porous modified reduced graphene oxide and its application in solvent‐free oxidation of cyclohexene with molecular oxygen

Nejad

Behzadi

Sheibani

2019

Applied Organom Chemis

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In the present work, ruthenium nanoparticles were synthesized on functionalized reduced graphene oxide (rGO). First, the surface of rGO was modified with two para‐arsanilic acid and dithiooxamide promoters to create the rGO with scattered hydrophilic positions. The ruthenium nanoparticles were synthesized and immobilized simultaneously in small hydrophilic micro‐reactors under mild conditions. Characterization of the synthesized nanocatalyst was confirmed with different techniques, such as transmission electron microscopy (TEM), X‐ray diffraction, Fourier transform‐infrared and scanning electron microscopy. TEM images of the synthesized catalyst show the Ru nanoparticles have diameters less than 6 nm. The designed nanocatalyst was investigated for the selective liquid phase oxidation of cyclohexene with molecular oxygen in an autoclave under solvent‐free conditions, which obtained a maximum of 91% conversion and 90% selectivity under optimized conditions. The catalytic activity over rGO‐AO‐TO/Ru recycled catalyst remained at a satisfactory state after at least five runs.

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“…In the last years, Single Layer or Few Layer Graphene (SLG-FLG) have been widely exploited to obtain novel high performance devices for different types of applications from electronics [1] to energy storage [2], sensors [3], biomedical implants [4] and others [5,6]. The quality of the SLG or FLG has been found to be a critical issue for the functionality of the devices and hence it is fundamental to improve the production and synthesis steps to avoid defects.…”

Section: Introductionmentioning

confidence: 99%

Lift-Off Assisted Patterning of Few Layers Graphene

et al. 2019

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Graphene and 2D materials have been exploited in a growing number of applications and the quality of the deposited layer has been found to be a critical issue for the functionality of the developed devices. Particularly, Chemical Vapor Deposition (CVD) of high quality graphene should be preserved without defects also in the subsequent processes of transferring and patterning. In this work, a lift-off assisted patterning process of Few Layer Graphene (FLG) has been developed to obtain a significant simplification of the whole transferring method and a conformal growth on micrometre size features. The process is based on the lift-off of the catalyst seed layer prior to the FLG deposition. Starting from a SiO2 finished Silicon substrate, a photolithographic step has been carried out to define the micro patterns, then an evaporation of Pt thin film on Al2O3 adhesion layer has been performed. Subsequently, the Pt/Al2O3 lift-off step has been attained using a dimethyl sulfoxide (DMSO) bath. The FLG was grown directly on the patterned Pt seed layer by Chemical Vapor Deposition (CVD). Raman spectroscopy was applied on the patterned area in order to investigate the quality of the obtained graphene. Following the novel lift-off assisted patterning technique a minimization of the de-wetting phenomenon for temperatures up to 1000 °C was achieved and micropatterns, down to 10 µm, were easily covered with a high quality FLG.

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High performance of visible-NIR broad spectral photocurrent application of monodisperse PbSe nanocubes decorated on rGO sheets

Cited by 25 publications

References 56 publications

Aqueous‐Phase Synthesis of Size‐Tunable PbSe Nanocubes at Room Temperature for Optical Property Characterization

Aqueous‐Phase Synthesis of Size‐Tunable PbSe Nanocubes at Room Temperature for Optical Property Characterization

Fabrication of ultra‐small ruthenium nanoparticles on porous modified reduced graphene oxide and its application in solvent‐free oxidation of cyclohexene with molecular oxygen

Lift-Off Assisted Patterning of Few Layers Graphene

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